WP_Customize_Setting::get_root_value( mixed $default_value = null ): mixed

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 * @since 4.4.0
 *
 * @param mixed $default_value Value to return if root does not exist.
 * @return mixed
 */
protected function get_root_value( $default_value = null ) {
	$id_base = $this->id_data['base'];
	if ( 'option' === $this->type ) {
		return get_option( $id_base, $default_value );
	} elseif ( 'theme_mod' === $this->type ) {
		return get_theme_mod( $id_base, $default_value );
	} else {
		/*
		 * Any WP_Customize_Setting subclass implementing aggregate multidimensional
		 * will need to override this method to obtain the data from the appropriate

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